Hair is susceptible to becoming fragile every time it is brushed, styled, exposed to hot tools, chemical processing (which can include color), and even from friction caused by fabrics like your pillow. These external factors stretch and stress hair, which can weaken the outer cuticle and inner cortex, leading to a loss of strength, elasticity and eventually cause breakage. Why is prevention from breakage important? Prevention from breakage is important because unlike your skin, which can regenerate itself, hair breakage is irreversible. Therefore, preventative care is necessary to keep hair strong and resilient. Preventatively strengthening fragile strands helps to prevent breakage from occurring in the first place.